Greetings Washington, we hope you had a good weekend. Sunday afternoon, we snapped this photo of the Uline Arena near Second and M streets in Northeast, adjacent to the Union Station railyards. For those who don’t know, Uline — fka the Washington Coliseum — was the site of the Beatles first live concert appearance in the United States, has seen better days. Now a trash transfer station, the arena is one of the most engdangered…